Email cannot be sent from Roundcube and the following message is shown when attempting to send an email:
SMTP Error (-1): Connection to server failed.
An error similar to the following can also be found in the mail Exim log:
2022-11-28 22:55:43 TLS error on connection from [::1]:34936 (SSL_accept): timed out
tls_on_connect_ports Exim setting specifies a list of incoming SSMTP ports that should operate the obsolete SMTPS protocol and immediately set up a TLS session without waiting for the client to issue a STARTTLS command. When port 587 is added to the
tls_on_connect_ports list, Roundcube is unable to connect to Exim.
- Log into WHM as the 'root' user.
- Navigate to "Home / Service Configuration / Exim Configuration Manager."
- Click the "Advanced Editor" tab.
- Scroll down to the
- Set the value to
465, the cPanel default.
- Scroll to the bottom of the page.
- Click the "Save" button.